Money was historically an emergent market phenomenon that possessed intrinsic value as a commodity; nearly all contemporary money systems are based on unbacked fiat money without use value. Its value is consequently derived by social convention, having been declared by a government or regulatory entity to be legal tender; that is, it must be accepted as a form of payment within the boundaries of the country, for "all debts, public and private", in the case of the United States dollar.
The Octopus card (Chinese: 八達通; Jyutping: baat3 daat6 tung1, Cantonese) is a reusable contactless stored value smart card for making electronic payments in online or offline systems in Hong Kong. Launched in September 1997 to collect fares for the territory's mass transit system, it has grown into a widely used system for transport and other retail transactions in Hong Kong. It is also used for purposes such as recording school attendance and permitting building access. The cards are used by 98 percent of the population of Hong Kong aged 15 to 64 and the system handles more than 15 million transactions, worth over HK$220 million, every day.
The mark was a currency or unit of account in many states. It is named for the mark unit of weight. The word mark comes from a merging of three Germanic words, Latinised in 9th-century post-classical Latin as marca, marcha, marha or marcus. It was a measure of weight mainly for gold and silver, commonly used throughout Europe and often equivalent to 8 troy ounces (250 g). Considerable variations, however, occurred throughout the Middle Ages.
... that medievalist Edward Rand rang the doorbell of Harvard president Charles William Eliot and asked him: "I would like to go to Harvard; do you have any money?"
Image 15Athens coin (c. 500/490-485 BC) discovered in Pushkalavati. This coin is the earliest known example of its type to be found so far east. (from Punch-marked coins)
Image 28Sino Tibetan silver tangka, dated 58th year of Qian Long era, reverse. Weight 5.57 g. Diameter: 30 mm (from Tibetan tangka)
Image 29A 640 BC one-third staterelectrum coin from Lydia. According to Herodotus, the Lydians were the first people to introduce the use of gold and silver coins. It is thought by modern scholars that these first stamped coins were minted around 650 to 600 BC. (from Money)